This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 6 |
| 3 | 76 |
| 4 | 1510 |
| 5 | 41121 |
| 6 | 1424178 |
| 7 | 59857416 |
| 8 | 2957282370 |
| 9 | 167852629965 |
| 10 | 10757980606208 |
| 11 | 768190770422700 |
| 12 | 60461731639747100 |
| 13 | 5199414726620992073 |
| 14 | 484974399630368105130 |
| 15 | 48763257278485285019472 |